Sand separating and blending machine



June 18, 1929. F. s. HAEFNER ET AL 1,717,555

SAND SEPARATI NG AND BLENDING MACHINE Filed May 24, 1928 2 Sheets-5heet l June 18, 1929. F. s. HAEFNER ET AL 1,717,555

I SAND SEPARATING AND BLENDING.MACHINE Filed May 24, 1928 2 Sheets-Sheet 2' Patented June 18, 1929.

UNITED sra'rss PATENT OFFICE.

FRANK s. HAEFNER AND LEWIS r. ZWEIBEL, or -WILKES-BARRE, rnnnsrrvnnm.

SAND .SEPARATING AND BLENDING MACHINE.

Application filed. May 24,

This invention relates to sand separating and blending machines used in metal foundries to break up lumps of used sand and mix it with new sand, and separate all pieces of iron, pebbles and other unsuitable material from the mixed sand, and aerate and blend the same so that it is put into good condition for use in making the molds in which metal is cast. This invention consists of a centrifugal machine having a rotary wheel provided with toothed combs at its periphery combined with other necessary parts. and screens as hereinafter fully described and claimed.

In the drawings, Fig. 1 is a side view of a sand separator and blender constructed according to this invention, with two ground wheels left out, and portions of the casing broken away to show some of the parts inside it. Fig. 2 is a cross-section through the machine, taken on the line 2-2 in Fig. 1. Fig. 3 is an end view of the machine, looking from the rear. Fig. 4 is a side view of a portion of the wheel showing two toothed combs, and is drawn to a larger scale. Fig. 5 is a plan view of the parts shown in Fig. 4. Fig. 6 is a cross-section, taken on the line 6-6 in Fig. 4:, and also showing the retaining ring for the toothed combs. p

The machine is provided with a casing 8 which is preferably mounted on ground wheels 9 for convenience of transportation, and is provided with a hinged draft tongue 10 at its front end.

A rotary wheel 12 is secured on a shaft 14 and is arrangedinside the casing. The shaft is journaled in bearings 15 on the casing, ball bearings or other anti-friction bearings being preferably used, and a driving pulley 16 is secured on the shaft outside the casing. The wheel is preferably driven by an electric motor 17 of. approved construction inclosed in a compartment 18 at the upper part of the casing, and connected to the pulley by a belt 19. The wheel may however be driven by any other approved means. The wheel is formed of two disks or plates 20 spaced apart and provided with notches 21 at their peripheries. 1

These notches are wedge-shaped, and are largest at their outer ends. Toothed combs 24: are provided, and have pivots 125 at their ends, which are mounted to rock in the notches 21. Each comb consist-s of a fiat blade having teeth 26 arranged at anangle to the blade, and projecting forwardkfu'of it 1928. Serial Ne. 280,254.

when the blade is at the top of the wheel.

notches permits the blades to have a rocking motion, and theextent of the rocking -motion is limited by the flat sides of the pivots whlch come in contact with the sides of the notches, as indicated by dotted lines-inFig. 4t.

The wheel is driven at high speed in the direction of the arrow in Fig. 1, and its toothed combs are controlled by centrifugal force. The toothed combsare retained in the notches of the wheel by flanged retaining rings 27, formed in sections and secured to the sides of the. disks. The flanges" overlap the pivots, of the combs, and the sections of the rings permit as many as desired of the combs to be removed. f i

A feed hopper 28 for the sand is provided at the front part of the casing'above the front half of the, wheel, and an inclined screen 29 is secured in the upper part of this hopper. Curved guard plates 30 and 31 are secured int-he casing under thelower andfront parts of the wheel, and an opening 32is arranged between the guard plates under the center of the wheel for the discharge of anything which may fall u'ponthe-guard plates, and for the inlet of air from the bottom of the casing which is leftopen, and is supported when material accumulates upon it. The trap door normally rests against a lug 37 on the guard plate. l Doors 40 are secured over openings 41 in the sides of the casing, so that whena few combs require to be removed, the'sections of the rings 27 which hold them in place can be removed Without disturbingthe rest of the combs. The rear side of the casing 1s provided with ascreen 42 mounted in a frame 43 which is slidable vertically in guides 44; on thecasing.

This screen can be removed. and replaced as often as desired, and screens of various mesh can be used, orthe screen can be omitted altogether.

' A flexible toothed comb 45 is secured tothe rear side of the hopper over the center of the wheel. This comb 45 has teeth of resilient material, and it is provided to. retain the material temporarily in the hopper, and to permit any hard objects which may be caught in the combs'ot the wheel to pass to the rear without damaging the machine. I I I A The sand is fed or thrown onto the receiving screen, and falls through it onto or against the rapidly inoving toothed combs of the wheel, and these'combs carry it under the flexible comb 45', andblend and mix it, and discharge it by centrifugal force through the screen 42 onto the ground, or into any suitable receptacle placed to receive it. The screen 29 in the hopper prevents large lumps 'from being thrown onto the wheel, and lets the sand fall gently onto the wheel.

What we claim is: 1. In a sand separator and blender, a casing having an inlet opening for sand at its upper front part, a rotary wheel mounted in the easing and provided with toothed combs at 'its periphery, curvedguard plates secured in the casing under the wheel leaving an opening under its axis, and a detaining device'for Cal '. under the front and lower part of the wheel and forming a passage with the casing, and a ftrap'door normally closing the said passage.

ing having inlet and outlet openings for sand 3. Asand separator and blender as set forth in claim 2, the said trap door being pivoted to the casing and arranged to open down- 7 wardly.

4. YA sand separator and blender as set forth in claim 2, the saidtrap door being pivoted and arranged to open automatically when solidmatter accumulates upon it.

' 5. In asand separator and blender, a cas- V and havingalso an opening in its side, a removable cover for the side opening. and a rotary wheel mounted in the casingand provided with removable toothed combs at its periphery, the said side opening being provided for the removal of the toothedcombs '6. In a sand separator and blender, a casing having inlet and outlet openings for sand, a

, rotary wheel mounted in the casing and provided with tilting toothed combs at its periphery, and a detaining device for the sand secured above the wheel to" the rear ofthe sand inlet opening 7. A sand separator and blender, as set forth in claim 6, the said toothed combs being formed of flat blades and teeth arranged at an angle to the blades.

8. A sand separator and blender as setforth 1n claim 6, the said toothed combs being arranged in two alternating series with the teeth ofone series arranged in staggered relation to the teeth of the other series.

9. Afsand separator and blender asset forth in claim 6, the said wheel having disks provided with wedge-shaped notches in their peripheries, and thG'SZLlCl blades being pivoted to'rock in the said notches to a predetermined extent. 7 p

10. A sand separator and blender as set forth in claim 6 the said wheel havim disks e 7 n u b I provided with notches in their peripheries, and the said blade-sbeing provided with pivots which engage with the said notches, and

retaining devices secured to the said disks and keeping the blades in place.

11. A sandseparator and blender as set forth in claim 6, the said wheel having disks provided with notches in their peripheries, and the said blades being provided with pivots which engage with the said notches, and rings formed in sections secured to the said disks and provided with retaining flanges which overlap the notches and the pivots in them.

12. In a sand separator and blender, a casing, a rotary wheel mounted in the casing and provided with tilting sand impelling devices at its periphery which are projected radially 'when the wheel is rotated rapidly, and a detaining device for the sand secured in the upper part of the casing out of contact with the sand impelling devices and arranged crosswisevof the path of the sand driven oif by the sand impelling devices.

13. A sand separator and blender as set forth in claim 12, the said detaining device comprising a toothed comb arranged substantially radial of the axis of the said wheel.

14. A sand separator and blender as set forth in claim 12, the said wheel being provided with means for limiting thedefiection of the sand impelling devices when they strike hard lumps in the sand.

15. In a sand separator and blender, a casing having a substantially vertical sand delv livery screen and an opening at its bottom adjacent to the said screen, a rotary wheel mounted in'the casing and provided with sand impelling devices at its periphery, and

a detaining device for the sand secured in the casingadjacent to the sand impelling devices. Y

16. A sand separator and blender as set forth in claim 15, the said casing being provided with guides,- and the said screen being removable and slidable in the said guides.

. In testimony'whereof we aflix our signatures.

FRANK s; HAEFNER. LEWIS ZWEIBEL. 

